What audio interfaces not made by Apple ("third-party") are qualified for use with Logic Pro X?

Most audio interfaces that are compatible with OS X Mountain Lion 10.8.4 or later will work with Logic Pro X. If the device requires a driver to function in OS X, make sure an up-to-date driver is included with the device or that one is available from the manufacturer.

When you install Logic Pro X, Logic 8 or Logic 9 will not be replaced by Logic Pro X. The Logic 8 or Logic 9 sound library will be replaced with a completely reworked library, designed by world-class sound designers. For compatibility with your older projects, you can use the Sound Library Manager to download "Legacy and Compatibility" content. This ensures that your older sound library files are available for your existing projects.

When you install an update for Logic Pro X, the older version of Logic Pro X is replaced by the update.

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